Research On Motion Response And Loads Analysis Of The Mooring System Of Tidal Current Power Station

Marine reserves rich and renewable green resources. As a kind of available marine green energy, tidal energy is one of the key areas of current research on renewable energy. As an effective tool of ocean energy development and utilization, floating tidal power station has attracted increasing attention. Designing a reasonable mooring system for tidal power station has become a very important part of human exploitation of marine activities. However, tidal power station is different with general offshore structures. Its design depth is shallow, the variation range of working flow is large, and the influence from turbine cannot be ignored, which makes the design and calculation of mooring system has certain difficulties. Current Calculation software often ignore coupling between the vertical movement and the horizontal movement of the mooring system, and cannot accurately describe great influence of turbine on mooring system. These real situations make analysis of coupling motion and stress of tidal power station mooring system to be necessary.To solve motion response of floating-mooring coupling system, there are mainly two kinds of methods: time domain algorithm and frequency domain algorithm. Time domain algorithm could accurately simulate and describe the motion and load of mooring system, while frequency domain algorithm is computationally simple and can analyze the influence of different factors.This paper is the study of tidal power mooring system’ motion response and the mooring line’s stress characteristics. Based on the principle of the spectrum analysis, the frequency domain algorithm is applied to solve the motion equation of tidal current power mooring system.The paper includes the following contents. (1) Solving effect of turbine on tidal power station system, obtaining the hydrodynamic coefficients of two-dimension turbine, and then generalizing them to three-dimension turbine; (2) Based on the potential flow theory, solving the hydrodynamic coefficients of tidal power station carrier; (3) Describing the method to estimate the static load, and then estimating static loads of mooring system under different working conditions; (4) Introducing the principle of spectrum analysis and solving method of frequency domain response function; (5) Giving the solution method of equilibrium position and writing frequency domain analysis program of mooring system, which considered the vertical motion coupling effects on tidal power station mooring system. And then analyzing the force variation of mooring system with the consideration of turbine’s effects.